GitHub user zjffdu opened a pull request:

    https://github.com/apache/zeppelin/pull/1514

    ZEPPELIN-1516. NPE LivySparkSQLInterpreter thrown with %livy.sql interpreter

    ### What is this PR for?
    This PR fixed NPE issue in `LivySparkSQLIntepreter`, also it resolves the 
multiple thread issues discussed in #1503
    
    
    ### What type of PR is it?
    [Bug Fix]
    
    ### Todos
    * [ ] - Task
    
    ### What is the Jira issue?
    * https://issues.apache.org/jira/browse/ZEPPELIN-1516
    
    ### How should this be tested?
    * Enable shiro
    * Log in 2 users in 2 browsers
    * Start livy sql paragraph at almost the same time
    * 2 livy sessions are created correctly. 
    
    ### Screenshots (if appropriate)
    
    ### Questions:
    * Does the licenses files need update? No
    * Is there breaking changes for older versions? No
    * Does this needs documentation? No
    
    …rpreter

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/zjffdu/zeppelin ZEPPELIN-1516

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/zeppelin/pull/1514.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1514
    
----
commit 33d5cc5f890b08224cd993cf5293fe5de43a6a66
Author: Jeff Zhang <zjf...@apache.org>
Date:   2016-10-14T01:27:52Z

    ZEPPELIN-1516. NPE LivySparkSQLInterpreter thrown with %livy.sql interpreter

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